#36 N_GLOBAL_NODES overflow

[Laurent]

The N_GLOBAL_NODES overflow error is not documented.
Through the C code, I think that the maximum of subckt nodes is 1005 : is that the wright understanding ?

BRgds,
Laurent

[marcel hendrix]

On 2019-05-24 11:35, Laurent wrote:

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** [support-requests:#36] N_GLOBAL_NODES overflow**

Status: open
Group: v1.0 (example)
Created: Fri May 24, 2019 09:35 AM UTC by Laurent
Last Updated: Fri May 24, 2019 09:35 AM UTC
Owner: nobody

The N_GLOBAL_NODES overflow error is not documented.
Through the C code, I think that the maximum of subckt nodes is 1005 :
is that the wright understanding ?

BRgds,
Laurent

Is this one or two questions?
The biggest circuit I have here has more than a million nodes.
When I wrap it in a single subckt it still works?

Number of lines in the deck = 1603640
Netlist loading time = 5.670 sec.
Netlist parsing time = 0.265 sec.

-marcel

[Laurent]

This a remark about the documentation of : "N_GLOBAL_NODES overflow"

Second, I found out that it is a limitation in the number of pin of a subckt : < 1005
Is it right that the number of subckt pins is limited ?

Laurent

[Dietmar Warning]

Yes, it is right.
Extract from subckt.c:

define N_GLOBAL_NODES 1005

/---------------------------------------------------------------------
* table is used in settrans and gettrans -- it holds the netnames used
* in the .subckt definition (t_old), and in the subcircuit invocation
* (t_new)
--------------------------------------------------------------------/
static struct tab {
char t_old;
char t_new;
} table[N_GLOBAL_NODES]; / That had better be enough. */

Maybe the naming is a bit misleading for the error message.

Dietmar

[Laurent]

I suggest to place N_GLOBAL_NODES as an option.
I agre that 1005 shoud be OK for most of the circuit.
In my case, I want to simulate a very large array of cells (1000x1000), with n inputs/outputs so the connection to the array is : 1000 x n I/Os
If I could change that value with an option N_GLOBAL_NODES, NGspice would be perfect !

Thanks! Best regards !
Laurent